I don't read it as weakness necessarily, but I do read it as a sign of not being VERY strong. In other words, when Zy makes that quick call with a 4 card straight on the board, I know he doesn't have the straight. If he did, it would take him at least a second or two to decide how to play it. "Should I just call now, or should I raise?" The instacall seems more like a club draw here. If I was the opponent, I would have fired on the river too and shaken my head when Zy turned up AK.
FWIW, yes, nice result here, but I think this call is probably slightly -EV in the long run... While he probably doesn't have the straight, he could be "bluffing" with a lot of hands that beat AK here.
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